The Google Play Store has changed.

Still can go to the Play Music Store
https://play.google.com/store/music

Will have to scroll way down to see Song of the Day

Link to the album A Color Map of the Sun (Deluxe Version) - track #1
https://play.google.com/store/music/album?id=Bhhv46feupgdaiidircdj7nlosq

Direct link to song is below
https://play.google.com/store/music/album?id=Bhhv46feupgdaiidircdj7nlosq&tid=song-To6qfsr643xworw3c6fch4ow5gu

Please note:
1. Need a Google Account to purchase this.
2. Need a Credit Card - can get by with any expired cards work just fine. There is no charge.